just the shoulders and head. they should actually call it a non-bust. of course, most composers, being male, didn't have a bust anyways.
preferrably, though - just a plaster of the fingers would do. take a friend that looks like they have the same looking fingers as chopin. pose them - plaster them and then write chopin on the front of the hands. you can find the pics here (scroll down to them)
https://hjem.get2net.dk/Brofeldt/index.htm you have beethoven's, chopin's (the one with long fingers/ fingernails), and liszt's.
hmm. it won't come up. i found it while googling 'fingering prokofiev 3 piano concerto'
or, bake a cake!